Supremal Coherence and Rigidity at Infinity: A Route U2 Proof of the Riemann Hypothesis

This record contains a preprint manuscript by Kouichi Tama presenting the Route U2 argument for the Riemann Hypothesis. The manuscript organizes the proof around a tube-calibrated offset-window framework, a manuscript-local bridge package, a landing-side decomposition and denominator-legality package on G = G_Z ∩ G_S, and a final U3 certification that admissible candidate times are not exhausted in the final landing passage. The claimed closure chain proceeds through the bridge-side package, the active landing-side chain, and the final deduction 9.45 → U3 → 9.46. The main uploaded manuscript is the clean publication-prep version. A support bundle and a RouteU2Lean source and verification snapshot are also included for provenance, orientation, auxiliary expansion, reproducibility, and independent inspection. The manuscript PDF should be treated as the primary citable object. This is a preprint record intended for public archival, citation, and independent verification. DOI: 10.5281/zenodo.21056615